Infatuation is what's present at the beginning of relationships. But without continuous effort by both people, the initial excitement can fade and warm feelings can disappear over time. Unless both partners make a conscious effort to renew their feelings for one another—every day—you risk not only a physical disconnection, but an emotional one, as well. 

What to do: The secret is always in the little things. Hold their hand. Sit next to them on the couch. Kiss them hello when you get home and goodbye when you leave. Walk next to them. Send them a loving text for no reason in the middle of the day.

Bottom line: To build and maintain a long-lasting, successful relationship, you need to commit to your partner's emotional well-being. And when things are challenging or times are hard, that's when it's even more important to show them and put effort in.